Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbc485489b193c6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 21:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 221da90b1493e724e9bca5d18edea9e3 SHA-1: 40a1d996296df4b4cf0506570ffb499dc3f9a4f3 SHA-256: 4dbc485489b193c69a77140cf8f9d9d30a476cacff4f3a590214c4e75fc69983
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The embedded JavaScript is likely used to redirect the user to these external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sausalito.com/wysiwygfiles/file/25948522494.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/japesozufani.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/73577740570.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/80632673428.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/82570042265.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/83376332276.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/36197563561.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436c431b171---31148968303.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/favikugawubivupalago.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/99749346921.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/40996149138.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/wawixabetasi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kelemumopodel.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/tukoninowagipizu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/50171426501.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/19969973713.pdfIn PDF document text
    • http://snft.ro/media/file/66111030927.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/7630585304.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/rutadukezadimivugawem.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/66765564796.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/12265373229.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd9e1ae3bc---variroj.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/rokab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shadow+ninja+game+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10620 bytes
SHA-256: 32fb957efbf2d5510049d7dbabd243286c3d7ab15c145f909755aba880f2f879
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 17824 bytes
SHA-256: 12cc1103365434b3068297b48eaed75dbb1f22c2b74168c412229dcfc039192c

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